Ambient Illumination, Function - GF82.10-P-2014FH

Model 238

Up To Model Year 2021

Function requirements, general

No undervoltage or overvoltage
"Ambient illumination" function activated in the head unit (A26/17)
Rain/light sensor with additional functions (B38/2) signals "Darkness recognized" (detected by the light sensor (B38/2b2))
Exterior lights switch (S1) in position "AUTO"

The head unit transmits the status of the "Ambient illumination" function via the user interface CAN (CAN HMI), the electronic ignition lock control unit (N73) and the interior CAN (CAN B) to the front SAM control unit (N10/6).

The ambient brightness is detected by the light sensor in the rain/light sensor with additional functions. The rain/light sensor with additional functions reads in the signals of the light sensor directly, evaluates them and transmits information about the ambient light situation (dimness level) via the rain/light sensor LIN (LIN B16) to the front SAM control unit.

The front SAM control unit reads in the status of the exterior lights switch directly.

Ambient illumination, general

The ambient illumination is used for safely leaving and finding the vehicle in darkness.

The duration of the ambient illumination can be adjusted at the head unit in 15 second increments from t = 0 to 60 s.

The following light functions are activated here:

Standing/parking lights actuation
Standing/parking lights actuation is performed more intensely (brighter) during the ambient illumination.

Staging of the lighting takes place at the left taillight and parking light (E3e2) and at the left inner taillight (E3/1e2) as well as at the right taillight and parking light (E4e2) and at the right inner taillight (E4/1e2). To this end, the LEDs in the lights are switched on and off in time-delayed fashion. The duration of the staging lasts approx. t = 3 s.
Ambient illumination (with CODE P49 (Mirror package)) via left outside mirror ambient lamp (M21/1e1) in left outside mirror (M21/1) and right outside mirror ambient lamp (M21/2e1) in right outside mirror (M21/2)
Ambient illumination (with code 889 (KEYLESS-GO)) via left front door outer door handle illumination (E17/7) and right front door outer door handle illumination (E17/8)
Ambient illumination (Economic Commission for Europe (ECE) variant only with code P35 (Light package)) via the left front ambient light (E1e23) in the left front lamp unit (E1) and the right front ambient light (E2e23) in the right front lamp unit (E2)

The ambient illumination function encompasses the following partial functions:

Function sequence for headlamp switch-off delay (SWA) (outer OFF delay function)
Function sequence for locator lighting (AFB)

The headlamp switch-off delay and locator lighting functions run in parallel if necessary. An active headlamp switch-off delay (SWA) function is not terminated by a requested AFB function and vice versa.

Function sequence for headlamp switch-off delay (SWA)

The SWA function is activated by the driver after the engine has been switched off (change in circuit status from circuit 15 ON to circuit 15R ON) for the configured period of time. The electronic ignition lock control unit sends the status of circuit 15 to the front SAM control unit via the interior CAN.

The front SAM control unit then activates the standing/parking lights actuation.

In vehicles with code P49 (Mirror package) or code 889 (KEYLESS-GO), the front SAM control unit transmits the request to switch on the ambient illumination via the interior CAN to the following control units:

Left front door control unit (N69/1) (with code P49 (Mirror package) or code 889 (KEYLESS-GO))
Right front door control unit (N69/2) (with code P49 (Mirror package) or code 889 (KEYLESS-GO))

In ECE vehicles with code P35 (Light package), the front SAM control unit also transmits the request to switch on the ambient illumination via the interior CAN, the electronic ignition lock control unit and the periphery CAN (CAN PER) to the following control units:

Left headlamp control unit (E1n9)
Right headlamp control unit (E2n9)

The left front door control unit actuates the left outside mirror ambient lamp (with CODE P49 (Mirror package)) and the left front door outer door handle illumination (with CODE 889 (KEYLESS-GO)).

The right front door control unit actuates the right outside mirror ambient lamp (with CODE P49 (Mirror package)) and the right front door outer door handle illumination (with CODE 889 (KEYLESS-GO)). The left headlamp control unit actuates the left front ambient light. The right headlamp control unit actuates the right front ambient light.

During the OFF delay time, after lock confirmation flashing, the ambient lights in the front lamp units illuminate in blue for t = 2 s and then turn white.

Opening a vehicle door or the trunk lid starts the function again. If all vehicle doors are closed again, the function is restarted.

The front door control units transmit the status of the front doors via the interior CAN to the front SAM control unit. The status of the trunk lid is sent by the rear SAM control unit (N10/8) via the interior CAN to the front SAM control unit.

The active SWA function is interrupted by switching on circuit 15 or by triggering an anti-theft alarm system (ATA [EDW]) alarm (with code 551 (Anti-theft alarm system (ATA [EDW]))).

Function sequence for AFB

When unlocking the vehicle, the ambient illumination is switched on for a period of t = 40 s (time of automatic relocking).

The electronic ignition lock control unit sends the status of the central locking via interior CAN to the front SAM control unit.

Left front door control unit (with code P49 (Mirror package) or code 889 (KEYLESS-GO))
Right front door control unit (with code P49 (Mirror package) or code 889 (KEYLESS-GO))

In ECE vehicles with code P35(Light package), the front SAM control unit also transmits the request to switch on the ambient illumination via the interior CAN, the electronic ignition lock control unit and the periphery CAN to the following control units:

Left headlamp control unit
Right headlamp control unit

The left front door control unit actuates the left outside mirror ambient lamp (with CODE P49 (Mirror package)) and the left front door outer door handle illumination (with CODE 889 (KEYLESS-GO)).

The ambient lights in the front lamp units light up in blue for t = 2 s and then turn white.

If the engine is started within t = 40 s, the AFB switches to auto on/off driving lights.

	Electrical function schematic for ambient illumination		PE82.10-P-2064-97DCA
	Overview of exterior lights system components		GF82.10-P-9998FH